381687405 has 32 divisors (see below), whose sum is σ = 668884608. Its totient is φ = 184320000.

The previous prime is 381687391. The next prime is 381687413. The reversal of 381687405 is 504786183.

It is not a de Polignac number, because 381687405 - 2⁸ = 381687149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37905 + ... + 46905.

It is an arithmetic number, because the mean of its divisors is an integer number (20902644).

Almost surely, 2^381687405 is an apocalyptic number.

It is an amenable number.

381687405 is a deficient number, since it is larger than the sum of its proper divisors (287197203).

381687405 is a wasteful number, since it uses less digits than its factorization.

381687405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9277.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 381687405 is about 19536.8217732568. The cubic root of 381687405 is about 725.3861787243.

It can be divided in two parts, 381 and 687405, that added together give a palindrome (687786).

The spelling of 381687405 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, four hundred five".